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Swift: Fix defaultImplicitTaintRead on fields #14661

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Merged
MathiasVP merged 4 commits into from
Nov 8, 2023
Merged

Swift: Fix defaultImplicitTaintRead on fields #14661

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c82eb4d
Swift: Test spacing.
geoffw0 Oct 31, 2023
554007b
Swift: Add a couple more test cases close to the failures.
geoffw0 Oct 31, 2023
206acea
Swift: Fix defaultImplicitTaintRead for sinks that are field accesses…
geoffw0 Nov 1, 2023
48c3db2
Swift: Change note.
geoffw0 Nov 1, 2023
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5 changes: 5 additions & 0 deletions swift/ql/lib/change-notes/2023-11-01-field-sinks.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
category: minorAnalysis
---

* Fixed a bug where some flow sinks at field accesses were not being correctly identified.
8 changes: 6 additions & 2 deletions swift/ql/lib/codeql/swift/dataflow/internal/TaintTrackingPublic.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -32,8 +32,12 @@ predicate defaultImplicitTaintRead(DataFlow::Node node, DataFlow::ContentSet cs)
// So when the node is a `PostUpdateNode` we allow any sequence of implicit read steps of an appropriate
// type to make sure we arrive at the sink with an empty access path.
exists(NominalTypeDecl d, Decl cx |
node.(DataFlow::PostUpdateNode).getPreUpdateNode().asExpr().getType().getUnderlyingType() =
d.getType().getABaseType*() and
node.(DataFlow::PostUpdateNode)
.getPreUpdateNode()
.asExpr()
.getType()
.getUnderlyingType()
.getABaseType*() = d.getType() and
cx.asNominalTypeDecl() = d and
cs.getAReadContent().(DataFlow::Content::FieldContent).getField() = cx.getAMember()
)
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